Project Report on Adhesive

Fevicol type adhesives come under the category of synthetic resins and latex adhesives and are made from polyvinyl acetate is a thermoplastic, odourless, tasteless, non-toxic, essentially clear and colourless resin. It has a non-crystalline and relatively branched rather than linear structure. Most grades of resin have a somewhat broad molecular weight distribution. They do not melt, but  soften over a temperature range. The resin is unaffected by sunlight, ultraviolet light and air, furthermore it will absorb a small amount of water. Polyvinyl acetate is neutral and non-corrosive. The various grades have good heat stability below 100oC, show slight discoloration at pproximately 150oC and decompose at 50oC but brittle at 10 to 15oC. The adhesive industry is currently the most important outlet for polyvinyl acetate. Polyvinyl acetate came into widespread use in 1940's as a synthetic resin substitute for hide glue. They found a place in wood adhesives and later were introduced in the familiar household 'White  glue'. Polyvinyl acetate is now used in adhesives for bookbinding, paper bags, milk cartons, drinking straws, envelopes, gummed types, convolute tubes, folding boxes, multwall shipping bags, labels and host of other common products - foils, film and paper board, decals, cigarette tips, lagging compounds, wood assembly, padding, automobile upholstery, pencils, leather binding, tolecements etc.